- 권한신청
- P-ISSN2233-8292
- E-ISSN2287-4747
- KCI
ISSN : 2233-8292
실내 굴진 시험을 통한 폼 주입 조건에 따른 인공 사질토 지반에서 EPB TBM 굴진성능에 대한 고찰
Study on EPB TBM performance by conducting lab-scaled excavation tests with different foam injection for artificial sand
신다한
김대영 (현대건설(주) 기술연구소)
신영진 (현대건설)
최항석 (고려대학교)
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Abstract
During EPB TBM tunnelling, an appropriate application of additives such as foam and polymer is an essential factor to secure the stability of TBM as well as tunnelling performance. From the ’90s, there have been many studies on the optimal injection of additives worldwidely contrary to the domestic situation. Therefore, in this paper, the foam, which is widely adopted for soil conditioning, was selected as an additive in order to investigate the effect of foam injection on TBM performance through a series of laboratory excavation tests. The excavation experiments were carried out on artificial sandy soil specimens with consideration of the variance of FIR (Foam Injection Ratio), FER (Foam Expansion Ratio) and Cf (Surfactant Concentration), which indicate the amount and quality of the foam. During the tests, torque values were measured, and the workability of conditioned soil was evaluated by comparing the slump values of muck after each experiment. In addition, a weight loss of the replaceable aluminum cutter bits installed on the blade was measured to estimate the degree of abrasion. Finally, the foam injection ratio for the optimal TBM excavation for the typical soil specimen was determined by comparing the measured torque, slump value and abrasion. Note that the foam injection conditions satisfying the appropriate level of machine load, mechanical wear and workability are essential in the EPB TBM operational design.
- keywords
- EPB TBM, 굴진 성능, 쏘일 컨디셔닝, 폼, 실내시험, EPB TBM, TBM performance, Soil conditioning, Foam, Laboratory test
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